document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=475279>Question 475279</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A certain river has a current of 3 miles per hour. A boat takes twice as long to travel upstream between two points as it does to travel downstream between the same two points. What is the speed of the boat in still water?<BR>\n" );
document.write( "a. 3 miles per hour<BR>\n" );
document.write( "b. 6 miles per hour<BR>\n" );
document.write( "c. 9 miles per hour<BR>\n" );
document.write( "d. 12 miles per hour<BR>\n" );
document.write( "e. The speed can't be determined from the given information.<BR>\n" );
document.write( "HELP ME PLS.......... :) & explain it pls.. :)<BR>\n" );
document.write( "Thanks. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #325902 by </B><A HREF=/tutors/aboutme.mpl?userid=mananth><B>mananth(16946)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=mananth><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=mananth><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=325902\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> boat speed = x mph<BR>\n" );
document.write( "current = 3 mph<BR>\n" );
document.write( "against current speed = x-3<BR>\n" );
document.write( "with current speed = x+3<BR>\n" );
document.write( "let y be the distance .\r<BR>\n" );
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document.write( "downstream t= y/(x+3)............1<BR>\n" );
document.write( "upstream 2t = y/(x-3)............2\r<BR>\n" );
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document.write( "multiply (1) by 2<BR>\n" );
document.write( "2t=2y/(x+3)\r<BR>\n" );
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document.write( "Therefore y/(x-3)=2y/(x+3)<BR>\n" );
document.write( "1/(x-3)=2/(x+3)<BR>\n" );
document.write( "2(x-3)=x+3<BR>\n" );
document.write( "2x-6=x+3<BR>\n" );
document.write( "2x-x=6+3<BR>\n" );
document.write( "x=9 mph speed of boat\r<BR>\n" );
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document.write( "m.ananth@hotmail.ca\r<BR>\n" );
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document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );